After years of working for various web agencies and software companies, and then more years working as a full-time freelancer, I finally took the plunge and lau

After years of working for various web agencies and software companies, and then more years working as a full-time freelancer, I finally took the plunge and launched my first SaaS, newtrien.com. While developing the website was time-consuming (especially since I'm doing it solo - programming, "design", etc.), I feel the hard part has only just begun, because I have zero experience on how to promote a service. But it doesn't matter, because even just launching the service was a great personal success for me, since I have a huge history of starting personal projects and not actually finishing them (who doesn't, right?). So anyway, newtrien.com is a website where people who own recipe blogs or websites can easily create nutrition facts labels for their recipes, and them embed those labels on their site. It currently has a database of about 800.000 nutritional facts for over 10.000 ingredients, but I plan to import more nutritional databases in the short future, as well as build a feature where users can add their own custom ingredients, on the off chance that some exotic new ingredient is missing from the database. I am looking for feedback on pretty much everything: business idea, website usability, design, etc. Thanks!